Bizarre Patents
An aircraft having vertical takeoff and landing capability provided with at least first and second laterally extending paddle wheels rotatable on a central axis perpendicular to the longitudinal axis of the aircraft fuselage and between its nose and tail.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5459749 | Multi-level superposed amplitude-modulated baseband signal processor A multi-level superposed amplitude-modulated baseband signal processor which has simple hardware structure and a filtering effect for bandwidth and power efficiency in a digital transmission system includes a data delayer, a signal level converter, an ope... | 10/17/1995 |
| 5454013 | Amplitude modulation method and broadcasting apparatus for carrying out the method An amplitude modulation system. An input analog signal indicating audio, etc., is converted into a digital form and the low-order bits of the resultant digital signal are converted into analog form. The resultant analog signal is used to control a gain of... | 09/26/1995 |
| 5268658 | Digital amplitude modulator and method of signal combining A digital amplitude modulator receives a plurality of phase coherent input signals from a plurality of amplifiers (A1-An) respectively representing the bits of a plural bit digital word and converts them to a single output signal on an output with a first... | 12/07/1993 |
| 5047705 | Digital amplitude modulation apparatus A digital amplitude modulation apparatus for amplitude-modulating a digital carrier having a frequency fc by a digital modulating wave associated with a sampling frequency fs1, at a sampling frequency fs2, wherein the conditions m×fs1=fs2, and fc=n/4× f... | 09/10/1991 |
| 4896372 | Pulse width modulator for AM-RF transmitter An RF-AM transmitter of the type including a power pulse amplifier driving an RF amplifier with a modulating voltage via a low pass filter includes a pulse width modulator for deriving variable frequency pulses having a frequency that is a direct function... | 01/23/1990 |
| 4888789 | Adjustable equalizer for compensating for high frequency rolloff and typical AM receivers An audio equalization circuit for use in an AM transmission system is described which is particularly useful for compensating for the high frequency rolloff found in currently manufactured AM receivers. A single potentiometer adjustment in the feedback pa... | 12/19/1989 |
| 4882552 | Coherent frequency exchange keying modulator Signal modulation apparatus for the transmission of binary data signals edying a process which results in superior side-lobe suppression compared with other forms of modulation such as frequency shift keying. The apparatus generates two carrier waves, th... | 11/21/1989 |
| 4871987 | FSK or am modulator with digital waveform shaping A binary signal modulator includes a sampling circuit for sampling a binary signal at a predetermined sampling frequency, a modulating circuit responsive to the sampled binary signal for generating a modulating signal, the rising and decaying timings of w... | 10/03/1989 |
| 4776036 | RF-AM transmitter with pulse width modulator An RF-AM transmitter includes a pulse amplifier responsive to a pulse width modulated (PWM) signal derived in response to an information signal. A low pass filter converts pulses derived by the power amplifier into a variable amplitude signal that is DC c... | 10/04/1988 |
| 4736389 | Technique for synthesizing the modulation of a time varying waveform with a data signal A technique for digitally synthesizing the amplitude modulation of one or more carrier signals with a random digital data signal is disclosed. Pursuant to the present invention, a memory unit is addressed by a plurality of binary coded digital symbols in ... | 04/05/1988 |
| 4723308 | AM signal transmitter An AM signal transmitter for generating an amplitude modulated carrier comprises a voltage-increasing stage and a power-increasing stage. The voltage-increasing stage includes a pulse width modulator, responsive to an input modulation signal, for producin... | 02/02/1988 |
| 4646327 | Waveform shaping apparatus A waveform shaping apparatus includes a shift register having a clock input terminal, data input terminals supplied with respective bits of a digital input signal and a plurality of data output terminals, and a plurality of coefficient multipliers connect... | 02/24/1987 |
| 4134072 | Direct digital frequency synthesizer A desired output frequency can be generated by applying a corresponding digital phase step number to an accumulator to generate multiples of the number for application to a sine wave look-up table from which digital samples of the sine wave amplitude are ... | 01/09/1979 |
| 4063199 | Radio frequency pulse width amplitude modulation system Amplitude modulation of a radio frequency carrier is achieved by generating a rectangular wave pulse train at the carrier frequency, the pulses of which vary in width as a function of the amplitude of the audio input signal. The audio frequency input wave... | 12/13/1977 |
| 3939303 | Digital video modulation apparatus A modulator for producing a digital sub-carrier amplitude modulated by a video or other modulating signal comprises sampling means for sampling the modulating signal at twice the process carrier frequency, and selector means for feeding the samples to an ... | 02/17/1976 |
